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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e94a7333d06140ef49ce639c9269dd65485c59e4db9a1d48c6beea51ff8f0b6' 
  AND token = 'Nkagz0uIScY2pkMcdbHuhs+31Ao1JrynBFx7275mk4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}